Code
P1707
DAEWOO
P — Powertrain
Brake switch
Views:
UK: 2
EN: 9
RU: 9
AI status
Completed
Completed
100%
Causes
- Failed or sticking brake light switch
- Misadjusted or mechanically damaged switch or pedal linkage
- Open, shorted, corroded or damaged wiring/connector to the brake switch
- Blown fuse or poor ground in the brake circuit
- Faulty Body Control Module (BCM) / Powertrain Control Module (PCM) input or software
- Aftermarket electrical modifications interfering with the circuit
Symptoms
- Brake lights not working or remaining on continuously
- Cruise control cancels immediately or will not engage
- Shift interlock (key/shift) behaves incorrectly
- ABS/stability or other warning lights may illuminate
- DTC stored and possible limp/limited features from vehicle modules
What to check
- Retrieve freeze frame and live data with a scan tool; observe brake switch state while pressing/releasing pedal
- Visually inspect brake switch, pedal linkage, and switch mounting/adjustment
- Check brake lights operation while an assistant presses the pedal
- Measure voltage at the switch connector (with connector connected) for expected reference and output signals
- Test continuity/resistance across switch terminals with pedal depressed and released
- Inspect wiring harness for chafing, pinched wires, or connector corrosion
Signal parameters
- Reference: battery supply ~12 V or module-supplied 5 V depending on vehicle design
- Switch closed (brake pedal pressed): output ~ battery voltage (near 12 V) or logic high to BCM/PCM
- Switch open (brake pedal released): output ~0 V or logic low to BCM/PCM (or open-circuit)
- Continuity: near 0 Ω when closed, open/infinite when open
- Response time: switch state should change within a few tens of milliseconds when pedal moved
Diagnostic algorithm
- Connect a scan tool, confirm P1707 present and view live data for brake switch input while operating the pedal.
- Verify brake lamp operation: have an assistant press pedal while you observe rear lamps. If lamps don’t respond, proceed to switch checks.
- Visually inspect switch mounting, plunger travel, and adjustment. Ensure the plunger is actuated through full travel when pedal is released/pressed.
- With ignition ON, back-probe the switch connector: verify reference voltage (battery or 5 V) and the switch output changes state when pedal moved. Note voltages and compare to vehicle spec.
- Measure continuity across the switch terminals directly (multimeter): closed = near 0 Ω when depressed; open when released. Replace switch if readings are incorrect.
- If switch tests good, inspect wiring and connectors to BCM/PCM for opens/shorts/corrosion. Wiggle test harness while watching live data for intermittent faults.
- Check fuses, relays, and ground points related to brake light/switch circuits. Repair any poor ground or fuse issues.
- If wiring and switch are good but DTC remains, check BCM/PCM input using manufacturer diagnostic procedures; consider module bench test or reprogramming as a last resort.
- Clear codes and road-test to confirm the fault does not recur after repairs.
Likely causes
- Brake switch contacts worn or seized (no change of state when pedal moved)
- Switch plunger not engaging due to incorrect switch position or broken retainer
- Pinched or broken wire at the switch harness or under-dash area causing intermittent connection
- Corroded connector terminals producing high resistance or open circuit
- Short to battery or ground caused by damaged insulation
- Failed BCM/ECM input driver (less common)
Fault status
Status
Brake switch circuit fault detected (P1707). Check brake switch, wiring, fuses, and module input. May affect brake lights, cruise control and shift interlock.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
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